Press.



PATENTED JULY 21, 1908.

P. W. BARHOFF.

PRESS.

APPLICATION FILED 001291901 5 SHEETS-SHEET l.

42 [ion /25 07? F. W. BARHOFF.

PRESS.

APPLICATION FILED OCT.9. 1907.

5 SHEETS-SHEET 2 PATENTED JULY 21, 1908;.

No- 893,892. PATENTED JULY 21, 1908'.

F. W. B ARHOFF.

PRESS.

APPLICATION FILED 0GT.9.1907.

5 SHEBTS-SHEET 3.

PATENTED JULY 21, 1908.

F. W. BARHOFF.

PRESS.

APPLICATION FILED 001:9.1907.

5 SHEETSSHEET 4.

a a p I 0 I Vii/Q7724).

PATENTED JULY 21, 1908.

F. W. BARHOFF.

PRESS. APPLICATION FILED OCT. 9.1907.

5 SHEETS-SHEET 5.

fiver/fol? W VOIW g I I I I I 4 M l UNITED STATES PATENT: OFFICE.

FRED W. BARHOFF, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE UNITED STATESFIBER LEATHER COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION OFCONNECTICUT.

PRESS.

Specification of Letters Patent.

Patented July 91, 1908.

To alt whom it may concern:

Be it known that I, FRED W. BARHOFF, a citizen of the United States,residin at Hartford, in the county of Hartford an 'State of Connecticut,have invented a new and useful Press, of which the following is aspecification.

This invention relates to a ress which is designed to withdraw water romand knit and solidify sheets of fibrous pulpy composition.

The object of the invention is to provide a comparatively simple powerpress which can be made to squeeze out and at the same time suck waterfrom and air through a mass of ulpy fibrous material, such as 1s used inthe ormation of thick sheets of pulp board, binders board and boardcontaining more or less leather fiber known as leather-board, so as toknit the fiber and produce a strong, hard sheet.

The machine which is illustrated is designed to receive a moldcontaining pulp and by hydraulic or neumatic pressure force a p atendown on t e top so as to compress the pulp and assist the escape of thewater b squeezing, and draw down a piston beneath the mold and suckwater from the pulp, and also if desired force air through the pul so asto increase the outflow of water, w ereby thick masses of wet pulp canbe relieved of free moisture in such manner as to knit the fibers and besolidified very rapidly and uniformly. 5

Figure 1 of the accompanying drawings shows a side elevation of a pressthat embodies the invention. Fig. 2 shows a central section on largerscale ofthe upper part ofthe press. Fig. 3 shows a similar section onthe same scale of the lower part of the press. Fig. 4 is a transversesection on,the lane indicated by the dotted line :ca: loo ing u wardly.Fig. 5 is a similar section on t e same plane looking downwardly. Fig. 6shows a plan of the bed. Fi 7 shows an edge view of the bed. And E ig. 8shows a section of the bed.

The machine illustrated stands u on a base 1. Mounted on this base is acy inder 2. The lower end of the cylinder is closed by the base and theupper is closed by a head 3. There is an opening 4 through the side nearthe bottom of the cylinder and an opening 5 through the side near thetop of the cylinder, these openings being designed to be piped to thesource of power which is employed to move the piston 6, that is fittedin this cylinder, and has a rod 7 which extends through a suitablypacked stufiin box 8 on the head. Set on the upper end of t 's lowerpower cylinder is a larger cylinder 9 which 1s open at both ends, and inthis cylinder is a suction iston 10 that is attached to the rod 7 oftheower power piston.

I Mounted upon the u per end of the intermediate or suction cylinder isthe bed 11. This bed is preferably rectangular in outline and has itsbottom formed of grate bars. The bed may have other forms of openingshowever, it is only essential that it be perforated so that the downwardmovement of the suction iston will draw-air through it without pullingdown the mold. In the upper face of the bed around the ed es are groovescontaining packings 12 which extend on all sides so as to make a tightjoint with the bottom of the mold frame 13 which is designed to receivethe mold containing thepulp to be dried and pressed.

Posts 14 are arranged to extend upwardly from the top of the bed andmounted on the u per ends of these posts is a cylinder 15,

t -s cylinder having outwardly extending arms with recesses forreceiving the uppef ends of the posts. The top of this upper cylinder isclosed by a head 16 and the ottom by a head 17 provided with a stufiingbox 18. There is an opening 19 through the side near the lower end ofthe cylinder and an opening 20 through the side near the upperend of thecylinder, these openings being designed to be iped to the source ofpower which is utilize to move the piston 21 wh1ch is fitted in thecylinder. The piston rod 22 from this upper power gplston extendsthrough thestuffing box and 1s connected with the laten 23 which isshaped to fit 1nto the mold frame. This platen is deslrabl 1 formed of aframe with grate, bars, but it may be perforated in other ways. Extend-10o ing upwardly from one side of the platen throu h an opening in theframe of the upper cylind er is a rod 24 which is utilized to gulde. theplaten in its movements and prevent it from turning. A hood'25 can bearranged the squeezing and suction pistons may be operated co-incidentlyor independently as desired, and the drying, knitting and solidificationof the mass may-be facilitated by the application of compressed air atthe proper time.

A mold containing pulp, which-ma be a mixture of leather, rags and paer, eaten to the necessary consistency, is p aced in the removed in thisway can escape through the mold frame and the power admitted to the uper and lower pistons so that the upper piston will force the laten downupon the ulp in the mold and compress it, and the ower piston will drawdown the suction piston and suck out water and moisture from the pulpwhile it is being compressed. The upper cylinder can alone be used ifdesired for compressing the pulp and squeezing out Water, or the lowercylinder can alone be used for sucking water out of the "pulp, or bothpistons can be used at practically the same time for sucking out thewater and compressing the pulp. The water which is bottom of the suctioncylinder which is left open'for that purpose. The flow of water inducedby the suction of the suction piston assisted by the flow of com ressedair through the mass knits together t e fibers in such manner as toroduce tough sheets.

With this ress t 'ck wet masses of pul can be quiclily compressed andhardene the free moisture being removed and the fibers knitted, so'thatthe sheet formed will be com act, strong and substantially dry. When t ecompression and suction is completed power is so applied as to lift theplaten and the suction piston and then another mold is slipped into theplace pushing out the mold with the ulp that has been solidi.- fied anddried. After the pulp has been compressed, if desired, while the platenis down steam or other hot fluid can be admitted below the mold throughthe opening 26 in the top of the suction cylinder for heatvulcaniz'ingthe I perforated bed, a suction plston below the ed, and a power pistonconnected with and designed to move the suction piston toward and fromthe bed, substantially as specified. 3. A press for solidifying pulphaving a perforated bed, a suction piston below the ed, means for movingthe suction pistontoward and from the bed, a laten above the bed, andmeans for moving tffe platen toward and from the bed, substantially asspecified.

.4. A press for solidifying pulp having a perforated bed, a suctionpiston or drawing air through the bed, means for moving the suctioniston, a platen movable toward the bed, and ward and from the specified.

5. A press for solidifying pul having a perforated bed, a suction pistonor drawing air through the bed, a power piston connected with andadapted to move the suction piston, a platen'movable to and from thebed,and a power piston connected with and adapted to-move the platen,substantially as specified.

6. A press for solidifying pulp having a perforated bed, a suctionpiston eneath the ed, a power piston connected with and adapted to movethe suction piston, a perforated laten movable toward and from the bed,and a power piston connected with and adapted to move the platen,substantially as specified. y i

7. A press for solidifying pul havlng a perforated bed, a suction piston.or drawing air through the bed, means for moving the suction plston, aplaten movable toward the bed, means for moving the platen, and meansbed, substantially as for forcing air down upon the bed, substantiallyas specified.

FRED W. BARHOFF.

- Witnesses:

HARRY R. WILLIAMS, 0. E. BUGKLAND.

means for moving the platen to-

